Fibrous coalescing filters are used to collect droplets from air streams and are widely applied in the process industry but liquid surface tension affects the filter performance. In this work, the wet pressure drop, saturation, liquid distribution, and filtration efficiency of both oleophilic and oleophobic filters were investigated using four liquids with different surface tensions but similar densities and viscosities to produce aerosols. The results showed that an increase in surface tension accelerated the evolution of the wet pressure drop of filters. The jump pressure drop increased significantly while the excess channel pressure drop was constant with growing surface tension. The average saturation in the channel layers decreased as the surface tension increased and the decrease rate was much greater in oleophobic than oleophilic filters. The liquid distribution was also influenced by the surface tension. In oleophilic filters, higher surface tension led to a smaller number of channels and a larger size per channel. The channel boundaries were difficult to distinguish when the relative wettability between the liquid and filter media was very high or very low. Both oleophilic and oleophobic filters showed higher filtration efficiency at steady state in both sub-micrometer and micrometer droplet-size ranges when separating liquids with a larger surface tension. Additionally, superoleophilic and superoleophobic filters were prepared through a dip-coating method. When compared with untreated (oleophilic) and superoleophilic filters, the superoleophobic filters had the best overall performance for each liquid type due to the greatly reduced liquid hold-up.

纤维聚结过滤器用于收集气流中的液滴，广泛应用于加工工业，但液体表面张力会影响过滤器的性能。在这项工作中，使用四种表面张力不同但密度和粘度相似的液体来产生气溶胶，研究了亲油和疏油过滤器的湿压降、饱和度、液体分布和过滤效率。结果表明，表面张力的增加加速了过滤器湿压降的演变。随着表面张力的增加，跳跃压降显着增加，而过量通道压降保持恒定。随着表面张力的增加，通道层的平均饱和度下降，并且疏油过滤器的下降率比亲油过滤器的下降率大得多。液体分布也受到表面张力的影响。在亲油过滤器中，较高的表面张力导致通道数量较少且每个通道的尺寸较大。当液体和过滤介质之间的相对润湿性非常高或非常低时，通道边界很难区分。当分离具有较大表面张力的液体时，亲油和疏油过滤器在亚微米和微米液滴尺寸范围内均表现出更高的稳态过滤效率。此外，通过浸涂方法制备了超亲油和超疏油过滤器。与未经处理的（亲油）和超亲油过滤器相比，超疏油过滤器对于每种液体类型具有最佳的整体性能，因为液体滞留量大大降低。